Drawing apparatus



. 1,441,939; C. MULLER.

DRAWING APPARATUS.

man APR.2| 1920. 2 SHEETS-SHEET 1.

Jan. 9, 1923.. c. MULLER.

DRAWING APPARATUS.

2 SHEETS-SHEET 2.

FILED APR. 2, 1920.

fmwizfw? tion embodyincr ll atented dani a "W123.

CHARLES l /FULLER, O13 ZURICH, SVTTTBZERLAIQ'D.

DRAWING APPARATUS.

Apphcation filed Aprilft,

To all whom it may conccivt:

lie it known that 1, CHARLES M'iinnnn, a citizen of the Republic of Switzerland, residing at Zurich, Leonhardstrasse 13, Switzerland, have invented certain new and useful Improvements in Drawing Apparatus; and I do hereby declare the following to be a clear, full, and exact descriptionof the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawing, and to letters or figures of reference marked thereon, which form a part of this specification.

This invention relates to drawing apparatus wherein two links are provided parallel to each other and adapted to act as parallel guide for squares, rules and the like.

The object of the present invention is to improve and simplify such apparatus.

To this end at least one guide is secured to an edge of a drawing board, and mounted traversable thereon is a carriage, preferably wheeled, that serves to carry parallel pivoted levers connected to a holder or support for drawing instruments such as a rule, square, triangle, curve or the like.

Several modes of carrying the invention into effect are shown by way of example on the accompanying drawing, on which:

Fig. 1 is a plan view of a first constructhe invention;

Fig. 1 is a bletail view showing the con- :nection of a sleeve and wheel frame;

Fig. 2 is a section on line A-B of Fig. 1;

lFig. 3 is a section on line O B of Fig. 1;

Fig. 4; is a plan of a modified arrangement;

Fig. 5 is a view of a second modification;

Fig. 6 is a section through the instrument carrier showing holding means for a pencil or the like.

Fig. 7 shows a modification of a detail.

Referring first to the exemplification of the invention shown in Figs. 1-3, 1 designates a rod provided with division marks, a slide 3 which can be fixed by a set screw 2 is slidably mounted on rod 1. The rod is carried near its ends in sleeves 1, in which it can be adjusted in an axial direction and fixed by set screws 5. Each sleeve is mounted on a frame 6 provided with two wheels 7 to form a carriage. The wheels are guided on parallel rails 8, which, in the example shown, are fixed by any suitable 1920. Serial No. 370,691.

means in the plane of drawing of a drawing board used in a horizontal position. Preferably one of the carriage frames (3 is arranged to be angularly adjustable against rod 1, which adjustment enables the car-- riage to run on rails S which are not exactly parallel to each other, the sleeve 1l eing mounted on a pin 4? loose in the carriage (3, Fig. 1 On pins 10 fixed to the slide 3 the ends of two links 11 are rotatably mounted whilst their other ends are connected to a disc 12. The latter is provided with a circular scale 13, which can be adjusted against an index mark 14, arranged on a projecting part of a bracket 15 which may be turned on and fixed to said disc, a square 16 being detachably secured to said bracket and serving as drawing instrument. A sleeve 18 slides on the rod 1 and can be adjusted along said rod by a set screw 17 (Fig. 2), a drawing pencil 20 passes through a lug of sleeve 18 and is held therein by a set screw 19. The links 11 are connected to disc 12 in an articulated manner shown in Fig. 3. The articulation of this joint may be suspended by tightening a throw-over nut 21, whereafter links 11 are rigidly connected to disc 12. On moving square 16 in any direction over the plane of the drawing by moving knob 22 by hand, links 11 will always remain par allel to each other and likewise all the positions of the square 16 will be parallel to each other. Long parallel lines may be drawn by means of the drawing pencil. 20 by simply causing the carriages to travel along the rails.

The constructional example shown in Fig. 1 difi'ers from that described above inasmuch as the rails 8 are not placed on the top of theplane of d 'awing 9 but are secured to the edges of the drawing board by clamps 23. This arrangement is likewise suited for horizontally used drawing boards.

in the case of a vertical drawing board 9 (Fig. 5) the rails 8 are fixed on upper and lower edges 24 of the board. The upper carriage frame 6 is fixed to rod 1, whilst the lower carriage frame 6 is guided by said rod and pressed against the lower rail 8* by a spring 25. Tn this arrangement at least one of the links 11. is extended beyond its fulcrum 10 and carries an adjustable counterweight 26 for counter-balaucing the weight of square 16 in every position. The two discs 15 and 12 and. their handle 22 are provided with a bore for the reception of a pencil that may be held by a setscrew 86.

As previously described the wheel frames (5 in Figs. 1 and at are arrang d so that they can only be used with horizontal drawing boards 9, and the wheel frames (3 of Fig. 0 can only be used with vertical drawing boards 9. Fig. 6 shows now a modification of the wheel frame arranged to be used with horizontal well as with vertical drawing boards 9*. [in inverted V-shaped rail 8 is fixed to an edge of the drawin board 9". lVheel frames 6 run along said rail each fitted with two pairs of wheels "7 and 7 arranged at angle against each other. A sleeve i is provided on each wheel frame in which the rod 1 is fixed by means of screw 5.

I claim:

1. In a drawin apparatus, a rail for attachment parallel to the edge of a drawing board, a wheeled ca-rria ge traversable on said rail, a pair of parallel levers pivoted at one end to said carriage, means to which the other end of said pair of levers is pivotally connected and a fastening on said means to hold a drawing instrument for directing the drawing of lines.

2. In a drawing apparatus, a rod, wheels on each end oi said rod, rails on-which said wheels are traversable, a slide adjustable along said rod, a pair of parallel lev i pivoted at one end to said slide, a disc connected to the other end of said pair 01 levers, and means on the disc to hold a drawing instrument.

In a drawing apparatus, a rod, a wheel carriage adjustable along each end of said rod, rails: for said carriages, a slide adjustable along said rod, a disc, a pair of parallel levers pivoted at one end to said slide and at the other end to said disc and means on said disc to hold a drawing implement.

a. In a drawing apparatus, a rod, a

wheeled carriage at each end of said rod and 1 adjustable along said rod, at least one olf said carriages being angular-l adjustable with respect to said rod, a slide adjustable along said rod, a disc, a pair olf parallel levers connected at one end to said slide and at the other end to said disc and means on said disc for holding a drawing instrument.

5. In a drawing apparatus, a rod, a wheeled carriage on each end ot said rod and adjustable therealong and angulurly udjustable thereto, rails for said carriages a slide adjustable along said rod between the carriages, pair of parallel levers secured at one end to said slide, a disc inljustulily connected to the other end oi said lever pair, a second disc adjust-able with respect to the first disc and means on said second (llFe to hold a drawing instrument.

(3. in a drawing apparatus, rails 'l'or attachment to opposite sides ol a dra.\\'in; board, a rod, wheeled carriages on said rails longitudinall and angularly znljustulnc with respect to said rod, a slide on said rod, parallel levers pivoted at one end to said slide, a disc to which the other end or said pair oi levers is zuljustabl connerted, a second disc angularly adjustable to the lirn't disc, and means on said second disc 'lor holding a rule and the like.

In testimony that I claim the loregoing as my invention, I have signed. my name.

CHARLES MllLLEl-t 

